dmvk commented on code in PR #22169:
URL: https://github.com/apache/flink/pull/22169#discussion_r1140223431


##########
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/adaptive/AdaptiveScheduler.java:
##########
@@ -1213,4 +1268,17 @@ <T extends State> T transitionToState(StateFactory<T> 
targetState) {
     State getState() {
         return state;
     }
+
+    /**
+     * Check for slots that are idle for more than {@link 
JobManagerOptions#SLOT_IDLE_TIMEOUT} and
+     * release them back to the ResourceManager.
+     */
+    private void checkIdleSlotTimeout() {
+        declarativeSlotPool.releaseIdleSlots(System.currentTimeMillis());
+        getMainThreadExecutor()
+                .schedule(
+                        this::checkIdleSlotTimeout,

Review Comment:
   > Could you explain why this method is necessary -don't we release the 
excessive slots in CreatingExecutionGraph? What is the scenario?
   
   We mark the slots as idle with the current timestamp and still need to keep 
them around until `current timestamp + slot idle timeout`; it's up to the slot 
pool to decide when slots should be physically released



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